Interfaces are forever
(The following talks about zope.interface interfaces, but applies equally well to Java interfaces, Go interfaces, and probably other similar constructs.)
When we write a function, we can sometimes change it in backwards-compatible ways. For example, we can loosen the type of a variable. We can restrict the type of …read more
Analyzing the Stack Overflow Survey
I am the parent of two young kids. It is easy to sink into random stuff, and not follow up on goals. Strict time management and prioritization means I get to work on open source projects, write programming books and update my blog with a decent cadence. Since a lot …read more
Publishing a Book with Sphinx
A Local LRU Cache
"It is a truth universally acknowledged, that a shared state in possession of mutability, must be in want of a bug." -- with apologies to Jane Austen
As Ms. Austen, and Henrik Eichenhardt, taught us, shared mutable state is the root of all evil.
Yet, the official documentation of functools tells …read more
Don't Make It Callable
There is a lot of code that overloads the
This is the method that
an object activates:
something(x, y, z)
something.__call__(x, y, z)
is a member of a Python-defined class.
At first, like every operator overload, this seems like a …read more
Staying Safe with Open Source
A couple of months ago, a successful attack against the Node ecosystem resulted in stealing an undisclosed amount of bitcoins from CoPay wallets.
The technical flow of the attack is well-summarized by the NPM blog post. Quick summary:
- nodemon, a popular way to run Node applications, depends on event-stream.
- The …
Checking in JSON
JSON is a useful format. It might not be ideal for hand-editing, but it does have the benefit that it can be hand-edited, and it is easy enough to manipulate programmatically.
For this reason, it is likely that at some point or another, checking in a JSON file into your …read more
If you want to speak to me, 1-on-1, about anything, I want to be able to help. I am a busy person. I have commitments. But I will make the time to talk to you.
- I want to help.
- I think I'll enjoy it. I like talking to people …
Common Mistakes about Generational Garbage Collection
(Thanks to Nelson Elhage and Saivickna Raveendran for their feedback on earlier drafts. All mistakes that remain are mine.)
When talking about garbage collection, the notion of "generational collection" comes up. The usual motivation given for generational garbage collection is that "most objects die young". Therefore, we put the objects …read more